v3.26.1
General administrative expenses and other net operating income (expenses) - Details of administrative expenses (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2023
KRW (₩)
Short-term employee benefits expense [abstract]        
Salaries ₩ 2,071,650   ₩ 1,932,906 ₩ 1,831,137
Employee fringe benefits 733,487   640,924 600,001
Share based payments 61,568   27,629 12,946
Retirement benefit service costs 201,431   134,514 119,670
Termination 176,387   1,533 164,922
Sub total 3,244,523   2,737,506 2,728,676
Depreciation and amortisation expense [abstract]        
Depreciation and amortization 580,520   539,924 503,035
Other general and administrative expense [Abstract]        
Rent 127,293   124,041 124,355
Taxes and public dues 197,412   202,541 190,334
Service charges 274,880   257,113 245,656
Computer and IT related 205,504   142,979 144,017
Telephone and communication 80,253   93,178 88,018
Advertising 188,960   156,795 161,896
Printing 5,443   5,955 6,072
Traveling 13,978   13,436 13,364
Supplies 8,357   9,021 9,156
Insurance premium 15,532   13,852 14,380
Maintenance 24,582   25,035 24,932
Water, light and heating 20,590   19,415 19,161
Vehicle maintenance 11,871   14,394 14,725
Others [1] 179,923   113,788 155,656
Sub total 1,354,578   1,191,543 1,211,722
Total 5,179,621 $ 3,585,629 ₩ 4,468,973 4,443,433
House welfare fund contribution ₩ 50,710     ₩ 40,047
[1] In-house welfare fund contributions amounted to 40,047 million Won and 50,710 million Won for the year ended December 31, 2023 and 2025.